Self-cooling strain insulator



L. STEINBERGER.

SELF COOLING STRAIN INSULATOR.

APPLICATION FILED OCT. I2. 1918.

1 $106,696, Patented Feb. 14, 1922.

WITNESS Zn A%RNEY PATENT OFFICE. A

LOUIS STEINBERGER, OF BROOKLYN, NEW YORK.

SELF-COOLING STRAIN INSULATOR.

' Specification of Letters Patent. Patented Feb, 14 1922,

Application filed October 12, 1918." Serial Ra -257,864.

T all whom it may concern:

Be it knownthat I, Louis STEINBERGER, a citizen of the United States, and a resident of the borough of Brooklyn, county of Kings, 'State' of New York, have invented certain new and useful Improvements in Self-Cooling Strain Insulators, of which the following is a Specification.

My invention relates to a strain insulator so constructed as to be self cooling when the interior of the same becomes heated electrically.

One of the objects of my invention is to provide a self cooling strain insulator. 'An other object is to provide means for ventilating the interior of a strain insulator. Another object is" to provide a strain insulator, the strain members of which are so arranged as to surround the ventilating conduit 'passin through the insulator body. Another ob ect is to provide a strain in sulator provided with strain members embedded within the central portion thereof and arranged adjacent to a conduit passing through the centralportion of the insulator. Other objects will appear from the speci fication and claims. 7

Referring to the drawings:

Fig. 1 is a vertical section through the central portion of my improved insulator, the section also passing through one of the strain members, portions of the'insulator being shown in elevation.

7 Fig1 2-is'a section on line'-'22 of Fig. 1.

It is well known that in actual operation the insulating material, especially 'at the central portion of the insulator, becomes heated and thereby the insulator loses its efficiency. In other words, its efiiciency is lowered. .If the heat is permitted to continue for a certain period the destruction of the insulator will inevitably follow.

The present invention is applicable to all insulators but especially to strain insulators and the insulator structure is so formed that the central portion thereof which heats rapidly, is provided with ventilating means, permitting the passage of the cool air therethrough and the exit of the hot air. As the ventilating means provide for the dissipation of the heat generated within the body of the insulator maximum efiiciency of the structure is maintained at all times.

It is desirable to keep the central portion of the insulator body which is adjacent the strain members as cool as possible, otherwise the. insulating material when heated I will so change in structure that the strain members will gradually move towards-each other, and it is obvious that as they so move the electrical value of the insulator is decreased. If the heatin is continued a sufficiently long time'wit out cooling there is danger of the two strain members contactterial, but I prefer to use the insulating material known in the art as elec'trose. B is the integral strain member made of metal and O is a two-part strain member also made of metal, which is provided with the wed known means for connecting the two parts together, namely, one of the projecting ends 10 of the strain member is rovided with screw threads which engage t e screw threads in the socket 11 of the removable portion of the strain member. 12 is screw threaded to the other projecting end 10 of the embedded portion of the strain member and to the abutting end 13 of'the removable portion of the strain member. This means of connecting the two-part strain member so that said parts may also be removed, are well known in the art and therefore do not require a general description.

The strain members are also of the type invented by me and consist of ring shaped portions 20 and 80, said rings bridgingthe upright portions respectively of the two strain members. The body portion of the insulator is molded about the strain members after they have been centered with respect to each other, bringing the ring portions of each insulator opposite each other so that the rims of the ring portions will be in direct alignment, leaving a uniform space between the rings. The body of insulating material is molded about the assembled interlocked strain members so as to form a shape as shown in the drawing, in which the insulating material is molded around the leg portions of each strain member to form The sleeve 7 projections 25,26, 27, (the fourth not shown 7 in the drawing) and there is alsoa central,

radially proj eeting flange 50 extending from insulating material, strain members provided with leg-and bridge portions embedded the insulator. V r

A central opening or conduit-60is'itormed through the body of the insulator, said conduit continuing. through. the ring portions of the embedded strain members. In :torin-. ing the conduit care has to betaken to pro-' vide a sufficient thickness of insulating ma} jterial aroundthe inner surfaces of the rings. f'A s' will be seen, the centrally arranged role passingthrough the'body otthe insulator and through the strain member's permits ot the ready ventilation of the insulator when it is; in actual operation andconnected to a line,tl1ereby tending to cool the central portion of the insulator, thus preventing its destruction by the generated heat.

It isto' be understood that the above description and drawings are merely illustrativeand the inventionisnot to belimited in any respect, except as defined th esubf joinedclaims. q I 7 Hav ng novvf described my 1nvent1on,what I claim as new fand d'e'sire: to s'ecure hy Letters Patent is -1; A' str'ain 'insulator provided with-interlooking strain members provided with leg and bridge portions, said insulator having ventilating conduit extending therethrouglili'n the same direction as the leg portions, saichconduit I passing through the bridge portions of-the strain members. 12, An insulator, "comprising a body of in sulating material, strain members therefor, said'strain" members embodying side portions 'and central portions connecting the sideportions together, said body of insulating material being provided with a'ventilatingconduit passing therethi'oughiin a direction substantially 3 parallel to the side portionsot the strain members and situated thereb'etvveen, said*-conduit also passing through the central portions o f'strai'n member's. V

3. .An' insulator-e consisting ofa body of therein, said body of insulating material 'bl11 provided with a ventilatinm conduit L Y t3 passing through the said bridge portions of the strain members, said condult also passing through the central ortion of the insulator in a directionsubstantially parallel to'thele'g portions of the strain members;

4;. PfiilnSUlatOI comprising bodyot in-'- sulatingmaterial, strain members provided portions of the" str'ain'members and situated therebetween and also p'assing' throughYthe central portions "of the strain'memb'erslj In an -insulator, a body of insul'ating materl'al, interloolnng'str'am members molded "therein, the" central portions of the strain members situated opposite each other;

the said central portions being ring shaped,

and a ventilating conduitpassingvthrougn H the bodyof the insulator and als'oi through the ring'portions of the strain members} 6. In an jinsulatorpa' body otiinsulating material, interlockingstrain members; as

sembled therein,'the central portions ozt-the" strain members situated opposite to each other, the said centralportions-"being ring shaped, and a ventilating conduit passing through the body of the insulatbr'and also through the ring portionsf' ot the strain members. "j.

in Witness whereof I have hereunt-o's'et my? hand at'the borough of Manhattan," city and StateotNeWv York, this fourth day of U0 tober,-*19l8.= g;- 

